fogarty



May 26, 1931. o. A. FOGARTY ELECTRICAL SWITCH IN OIL BURNING EQUIPNENTSFiled Jan. 24. 1927 2 Sheets-Sheet '1 May 9 o. A. FOGARTY 6.9 7

ELECTRICAL swmm IN OIL BURNING EQUIPMENTS Filed Jan. 24. .1927 2Sheets-Sheet 2 I 1 IL! I 11 1 r1 1 1 II Ilnl Jive/2 or Patented May 26,1931 UNITED STATES.

PATENT OFFICE ORVILLE ALDEN FOGARTY, 0F MONTREAL, QUEBEC, CANADA,ASSIGNOR T0 VILAS OIL BURNERS LIMITED, 01? COWANSVILLE, CANADAELECTRICAL. SWITCH IN OIL BURNING EQUIPMENTS Application filed January24, 1927.

The invention relates to electrical switches in oil burning equipments,as described in the present specification and illustrated in theaccompanying drawings that form part of the same.

The invention consists essentially of the novel features of constructionpointed out broadly and specifically in the claim for novelty followinga description containing an explanation indetail of an acceptable formof the invention.

The objects of the ivention are to efficiently connect breaks in safetycircuits with the least possible number of switches; to insure the mosteflicient operation in oil burners and at the same time avoid thedisastrous effects of explosions; to simplify the operations of safetymechanism with special reference to the actual running conditions of theburner; to facilitate the construction and arrangement of parts; andgenerally to provide in oil burning mechanisms, and in fact in anydevice of the kind wherein there is a driving member operated throughelec-;

trical connections, the greatest efficiency at the least possibleexpense of operation and construction. p

In the drawings Figure 1 is a diagrammatic view showing a stack switchand a resetting switch and the wiring therebetween.

Figure 2 is a vertical sectional view of a U-shaped tube, showing itsconnection to the central stack tube as well as the mounting of thedevice.

a Figure 3 is a sectional view of the casing and resetting switch,showing an elevation of the switch and operating parts.

Figure 4 is a vertical sectional view at right angles to the sectionalviews illustrated in Figure 3. v

Figure 5 is a vertical section at right angles to Figure 2.

Like numerals of reference indicate corresponding parts in the variousfigures.

Referring to the drawings, '10 is a U- shaped tube from which projectsupwardly the extension 11 directly in the middle, this extension beingturned inwardly and having the stack tube 12 secured thereto, or formingSerial No. 163,136.

part therewith, all of these, or the stack tube alone, being made ofglass that will stand a very high temperature.

- The U-shaped tube at the upper end is closed by the caps 13 and 14:,which contain the washers or pads of fibrous material 15, ordinarilyclosing the air hole 16 through said caps 13 and 14. The washers or pads15 are preferably of felt and cover the top ends of the tube 10, butbeing of porous material, these washers or pads will permit air to passtherethrough, and through openings in the caps, so long as said air isdriven by the tubes at a pressure higher than atmospheric, and thisairwill penetrate into and through the pads, when the mercury 36 is'raisedin the legs of the tube through the expansion of air in the stack tube12, the expansion of air in this tube being always caused by heatthrough the operations of the furnace.

The terminal contacts 17 and 18 are adjustably screwed through the caps13 and 14 respectively and are set in the position desired accordingtothe pressure expected, and are lockedin that position by the nuts 19.Naturally these terminal contacts 17 and 18, which are rods pass throughthe pads 15 into contact with the mercury when the latter is forcedupwardly through the expansion of air in said stack tube.

The terminals 23 and 24 are fixedly secured at the upper end of thecasing 21 and are wired to the contacts 17 and 18, the tube beingsecured by the strap 20 in a permanent position in relation to saidterminals 23 and 24. I

The terminals 23 and 24 are set in under the wall 25 and directly underthe holes 26 and 27 respectively, these holes being ordie narily closedby the cover plate 28 held by the screw 29.

The-casing 21 has an opening 31 through the back thereof, and extendingthrough the flange 30, in which it is securely held by the packing 32,this flange being inserted in an adapter 33 preferably screwed to thestack tube 3 1, the flange 30 being securely held to the adapter 33 bymeans of the said screw 35.

It will now be seen that an unusually sensitive device is provided inthis mercury electric switch for the mercury or other suitable chemicalfills the bottom of the U-tube 10 and this mercury on the expansion ofthe air in the stack tube 12 is forced upwardly in the legs of the tube,until it reaches the contacts 17 and 18, then the elecs trio connectionis established between these two contacts and maintained constantlywhile the pressure remains normal.

The air bubbles, which are indicated by the, numeral 36-a represent asurplusage and these are readily passed through the mercury and outthrough the felt pads 15 and air holes 16, thereby relieving any unduepressure, without permitting he ingress of any ,foreign clement.

The terminals 23 and 2a are connected to the terminals 37and 38 and thelatter terminals are connected by the-coil 39, so that the U-tube l0 andconnecting wires form really a shunt from a starting circuit andeventually a part of an operating circuit.

;The coil 39 is wound around a blind tube 40 containing acetone orspirits readily ex-, pandible, and this tube 40 extends-from a Bourdontube i-2, the loose end of said Bourdon tube being pivotally'secured bythe connecting bars 43 and i4; to a slotted pivoted lever 45. g e

The chief difference in this construction now being described is that inthe bar 44, there is an elongated slot 4c0a, through which the operatingpin47 extends, otherwise the machine may be bought on the market. V

The lever mechanism is contained between two fixed plates 48 and 49 andcomprises said pivoted lever a5 and the spring connection 50 drawing onsaidpivoted lever by means of the bars 51 secured to one arm of saidlever. r

The rocking bracket 52-supports the mercury tube 53, which hasthe twocontacts 54 and 55 thereinside-and projecting outwardly therefrom andconnected to the terminals 56 and 57. i

The bracket 52 is pivotally secured to the 7 plates 48 and 49 and rockswith the motion of the pivoted lever 45, and as the Bourdon tube 42 ispivotally secured to the slotted pivoted lever 45 the expansion of thistube willrelease the mercury tube bracket and throw its nose downwardly,with the result,

be overestimated, though the actualdetails of its working and thedescription of its parts. has not to do with'the invention, for

tion of the lJ-tube switch or stack switch, as

it may be. called, and thecombination of this stack switch with theoperation of the resetting switch, for it has already been said that thedetails oft-he latter are only concerned in the operation of the safetymechanism, which forms the subject matter of a pending application filedunder Serial be the broad and specific features of this U- shaped switchand its specific relation'to the tilting switch that will be claimed asthe distinctive features of this invent-ion. What I claim is:

U-shaped tube having anupwardly progecting extension from the centrethereof, a

stack tube secured to said extension, caps closing the ends thereof ofsaid U-shaped tube having lining padsot fibrous material, terminalcontacts 7 adjustably screwed through said caps and extending throughsaid pads, a casing enclosing said tube, terminals fixedly secured atthe upper end of said casing and adapted to be connected to saidterminal contacts, straps securing said. tube 1n a permanent position inrelation to said casing terminals, a cover plate closing in said casingterminals, sald caslng havlng .Number 118,808, consequently it will only7 a tubular rear opening through which said stack tube extends and wiresfrom said casing terminals forming a coil encircling an acetone tubemember.

Signed at Montreal, Canada.

ORVILLE ALDEN FOGARTY.

